Pachycephalosaurus, skull dome T-Rex and either simple or forking

and either simple or forking at outer end

this would have made Megarachne servinei the largest spider to have ever existed

Pterodactylus kochi is a small Pterosaur with a wingspan of only about 18 inches

3 feet) at the shoulder

Pachycephalosaurus, skull dome T-Rex and either simple or forkingPachycephalosaurus, meaning "thick headed lizard," is a genus of pachycephalosaurid dinosaurs. The type species, P. wyomingensis, is the only known species. It lived during the Late Cretaceous Period (Maastrichtian stage) of what is now North America. Remains have been excavated in Montana, South Dakota, and Wyoming. It was an herbivorous creature which is primarily known from a single skull and a few extremely thick skull roofs, though more complete